Here in PA we have deer farming.Just over our northern border in New York state, a deer farm brought CWD to the area.About 15 miles from our southern border there is CWD in West Virginia.I saw a deer farm not far from my hunting area that had plastic sheeting over the fences to prevent wild deer from nuzzling the tame deer inside.Apparently, this is the method of transmission of CWD from deer farms to wild deer.